Section 31(4) in The Static And Mobile Pressure Vessels (Unfired) Rules, 1981
(4)All electrical portable hand lamps shall be of a type approved by the Chief Controller.[31-A. Classification of hazardous area for flammable gases.-(1) A hazardous area for flammable gases shall be deemed to be-(a)a division "0" area, if inflammable gases of vapours are expected to be continuously present in the area;(b)a division "1" area, if inflammable gases or vapours are likely to be present in the area under normal operating conditions; or(c)a division "2" area, if inflammable gases or vapours are likely to be present in the area only under abnormal operating conditions or failure or rupture of an equipment.
